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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61e7d744ba995489aca5ec9a7e9975eafdf30caa2f60c181b280c2ea671c0e13' 
  AND token = 'RmYxV6rm9yVLonBahww6AotK86XiG7OJJnASAC9vJX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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