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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4d8f93b1353a734a55dc7cb31db8d0262ccf6859e491c342fd933e10a9f8fd1' 
  AND token = 'YyZJiERyQ7auX7GsSJRTi1inAnOlJ2cXws9rZ3zKZNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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