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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3304cfbaf0ba76bed35ffd8d5371824781e337f76eed2d7694853daafe7aa6b2' 
  AND token = 'p7/08rD/iNk1/y1apLXtyG+LAhe7d52Q2on0H5kjzVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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