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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34e928c65d77d646df3caab82e17a90559cacdd87293f20cfbba42d7165130d6' 
  AND token = 'a8I9H0Q8RrmJfAqWpDw3R9y3a7mG4IiDaqSZCuYUKSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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