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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '136edeb21286faaddf569dcd20c8b8cf3e1e9266eea630d65d0590fece128ed2' 
  AND token = 'ld9mpwlUikmUKpCYKnBbptl3f/Au/lsV5vBXdT5Y1XY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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