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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23859d9bed108ea541f9dfeaaf831c476e4f307901a389ca2ac4f79257199cdb' 
  AND token = 'v06jTD+K6f0PTkcbkIxRLPc6bEiMQVa5Jg0i5D2Qops=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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