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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3190ca6723e5d95998cfb1bea352b860aef3fe6537bb967218ba6bc38c65a6c5' 
  AND token = 'TS1jyQ20IqElqQ0SKtqnKUkDWAwRN/aWDCW5JTvOD/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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