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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ead0e7bf087e178b76b1b825a26d9e68c9285c2679041c93ce8a2c6fb939670' 
  AND token = 'cnkXXrKUybb7Wghc9kZgJP0jmfViBwoSuoPskclV8H8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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