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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d76a43d363e243cfd96f069d61258b1445c2441d3f97bcffbb941a8055ce22f' 
  AND token = 'vTmqONPolAg42ftNUnvu7hj3uu+9r+6ZKYTe3fN6bb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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