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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71c1b5043e708ea0b31fa5a14a9348817095180bfac5f4e1094cd849c246ab64' 
  AND token = 'PvG5qFwE09XZeP1hqCHMoD3TMTkI0OXHUqvIU92uYLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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