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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aba7394b8276cdee78c8997b6ebc44fc90eea953673ecc673077be19f3b8ca2c' 
  AND token = 'JJD29pjl/qkMklngRinG1I+M9LDfzTCtDScUKiDeXL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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