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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ef86e9a7781c2d32826c7a0639ce24210c4b32bc546a8aaf5a28decfe5a15e5' 
  AND token = 'cfQv8MG971GYKyA7riTLXi2Q/Ff2z5B9X17uT/t3PHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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