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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94af3169ea5981d3247b2d41ff56cb4baf0c6b3b4c80fee64aef4915aa7cc691' 
  AND token = '4Ol0Pqa4inPHR3Jn+CJD06mQNDYPFjkwqmFEK+Wq1zI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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