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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7bbe4a3789f1e19f8d44a3648551109c097b9dac04efd3ceee7bfe214914b11' 
  AND token = 'lf2/IeIhmLpoFh0jRKl/aI8dTnuoJGHdpkN597Ffwtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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