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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87a39f204176c7b072a62dcb1053c8867b04b82bfb8c307ea8d8557bd9adc416' 
  AND token = 'bh2Py7lEoKnegWr+DvEyBU5e9uUzrvs97K56WUrCUT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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