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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e454603f2d70a7de989f5019dbaa6136112646604d058242bb3374b27b73f320' 
  AND token = 'jrrxJ+uekDDKoll+3vDY10Pd2AadC0p80VySurnH/lQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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