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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '095b7439f2d9b5e28becf9e1347e39a38e8216984e5c04559e7d2362fecb9601' 
  AND token = 'bsVeV+aoa09VOuc6bco7MKJXtoU0FFR/XiSOWonJjao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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