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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37ce42d0e8d09561da8e71b037c30ca8b715898d0f9edc11c0b97396e770fda9' 
  AND token = 'kTmjkebAp+0AX4g/9XfJp8xgkM4TIs5P+r1NsRq9Fq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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