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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62976756f67c2e4441afe7e8d6cf96c13257a1bd5010f8f3c43508f415ce74c8' 
  AND token = 'u4ADjHX73ZgoUWgomiGQWhwtlwZgJmly+s14mescjo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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