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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44518f31045754483418d3a77abf58d5ff2f18a0ea65303e7ca9db63b5eb3179' 
  AND token = 'SNeaoE9X3Ryu6EHRUODsW/A6GrvD7HP3r7EmLccgH00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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