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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92966b8f95ff6d4cfebd843e816e4f3c64a6015e839a4194d46946af0c98d4a7' 
  AND token = '8HpVvKYLN5T7TRChk98i8FAo7LFVADfIogCEq5t0pR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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