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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d6660b8632b7389e8ccdd24d76c306230ec1cec46e857b7addf64c4d8c3d818' 
  AND token = 'dITNaDQrRF2KKGzXN/rNlclDB2COFTpdXF5gje7V18s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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