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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11a911538039de25dd99f2a9f984893faf62ae2c65be05c40f0e2e9e9068195f' 
  AND token = '0uvkxi8BBmJ3vgU9/of4l6A/ED380WLo6aOsunNfIZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}