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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea5c5a62ec7bf5c78bd20c6ae13d22d37788b486c436e05a0d2344c8d129d587' 
  AND token = 'Tu6owcuWAqMn32IM1C56HF6M9J5hmM209f/E40B1dcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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