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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1acc59445aa0ff83025e82db4a2f9f91b94a9a884452976cdd5dd9a369a4fbd' 
  AND token = 'OI9lOch4otJo2p3S+hzf5HpcyGQQDgRwfX0gSO/i2yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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