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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8084acb8d5434295aa0475b077def80f0aa9c43bca5f8f407230a4c4f94c7e0b' 
  AND token = 'B9TTHhwmSswz1x7XNFpQWocZa5nfhj3Q4egforR0OJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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