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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '713231ff360aa2a825af926d3487f23f0c76247eb55a0829e92ae3fdfae3905d' 
  AND token = 'WQLlElwA11tibMHOL0Ic+q1P3s9CRqZ+089mply3bKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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