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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbeb5874fdffddd9e0764a0e2dd8024162f64dde7c76b6f9cacefe3a9c2722ea' 
  AND token = 'egKH9NJmgrsabcv9Zi2Uhw989PksZwGFPmdBwFziIbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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