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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f22a63587c33446217342d5bc0598ac6aef0a6293ce5005db2ddf3380b079ad4' 
  AND token = '7g06qk8LBXGLpdXU7+9M2ii3+0ySHM4jgEH+5lNVG+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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