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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '324dd32dc797dcf30c100e15a9a608b7661df505ce73d60f083d70b5e4a4c99c' 
  AND token = 'h1uucvtku+lWRLCuJ+qBSUfKsmOxQDRFA7sMG4GTvvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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