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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1da3a7eb3a5466efc3cce79cc9ff8a5b4a75227a1dc9bbe3abdef3febefb8ad1' 
  AND token = 'R172zc8YFhgAxRyS/kXTYR+yP5uaRGv0XnqIAOdrAGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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