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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '885bedd3fe5d32f1d4a6e4b6a8d3d3b68727409a2096c65bfbbc413822313df3' 
  AND token = 'OAyWkMzrRlacygDnoAojF5az7ijAAv3Z67kklxLvHJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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