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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '130e4292df6e501e7083c4bf42f878a9ae0e3e9bb9daaf737ffe7eb21e230734' 
  AND token = 'r02guVoeh2Htp/NtlxDy0OhDqi89+WiC/AU6CuxGPAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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