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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf97170bda760acd09a3f5b48b6a899127ef072304d4cf4cabf3d8b1ddabe374' 
  AND token = 'YepXx0A0n2ITp3mmGZcXC7ycaaqdrLqDpFbQI4ieWuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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