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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42fea50dd408fdf66c8418ee84aaa3956d67807118e9b697a9766d9037522b0b' 
  AND token = 'LlQgYas4Uam098tGgBLnqKTorOymPFo2zNN3hzG6pws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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