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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42b98c22dc27975f05e28679667d3475f2cff38364d936f7bc1e7634e2a109c5' 
  AND token = 'lIpHocWZoyyJD0uO7qJ/t2sjUaF9PKa4Ovu5n4qA7fA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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