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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83b432352e9885d9d8e5c4b090226e3ecbf238d91cd7b4c3ad0c4d185319f304' 
  AND token = '6epot2ro6JAbAQVSiQN8N/7/kBNyz13ILBecG1LP2sQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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