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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1d742e5e0b194025bc68ff1ccc6e6e36e939541ed85d6656be86275ab6f0715' 
  AND token = '4ivvL2fpGr758EBM+mqeEco0/4N+RagSG126c+F+8Zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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