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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbd38ade36820da805cdb4e8e7b37fd4298e9cff9bad6c43746285a4e8eed516' 
  AND token = 'sR8imxgss0E8ietRfS0Pcerekzvhz1xn3qfUIt/XSBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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