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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c10c478a19ffd7aea2f8bc8784821677981517e1eecc412d7c81cfde9c03ea1b' 
  AND token = 'wR4mhURfc7XZvOW3bOHWsNvz53a6SVGsH61kUJr9BPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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