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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d4fabccae4708d2cd58c7ac9b4dc94069992a303faaf205d7d2fa3806e462a1' 
  AND token = 'Y2dJ8X3Tgo+YGSsrQWe93ytzvpJJZXm/HI2Fpk30I4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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