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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05dbaeffbd721cbc7b62140881d1563619620ca51863771e8b37c2d5e11a9394' 
  AND token = 'OD0Gr5ShexxBQvMGMpr2rQ4u/3sTW/9YvmuG4T7N7aQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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