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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8f7b11a2e3e15fd01a59c545d06a350ec69dee8f4154c1480fe7834deb22d58' 
  AND token = 'qjH+peKo9PxM6MdiGLE4t6pt98oHuHtx0vj0JzG7XbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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