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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ead8a975152904348557e53d46c73c9c61848020d886423fe22aa65b27585a0' 
  AND token = '/4TQ8+4RaKjoUDIZnHTlKSqRDibyr8b/K4sHtVDdYTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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