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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '308db6fbb277068d21c0e234d5456c8233fa8746224178366758c999a4f2b8f9' 
  AND token = 'bInCX/R0ZW4lNQiQwqcO+hFmJQA256NCOuz02CS4tao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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