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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4617c8c5c71291814d685c1d4009a838dcc0993251ec2c8d9941c2f40fdc0e8d' 
  AND token = 'jUokypi7+gYDMtZDk0hpRDz2wcH15QdFZakwmTF66PQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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