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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e97b7827fbcf3013f92cb56295fe49ac57d7bc532af1a6445874557b6f3036d6' 
  AND token = 'mEml7kkx/FGEdYqtuUsw8vBWqErGGOtnm1aHkI7TKU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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