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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c1e4a38ff6843b6232e9d181b899b38fa3f845354b78af4defd29b0b7d9a5bb' 
  AND token = '4e1GyeQ47WrddoZ3hi9klA5YZFRrRbiccyc9Y8GEU2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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