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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c37b0c6ece63563819a1e631c8382c5394e1e8822355ecb1ded853ae1c91fd29' 
  AND token = 'wv4JcHb0FFQtBszT78heNC3Gn6g91s98mhRhHuupk8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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