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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1039ccc466ddd7f0f2189288d7cc4044f20e2ed85e4c08f34fe6c236a77e00b3' 
  AND token = 'dmfMKbOrcARGgvuEVCRR4u6o5jUDkex0Zl1cOflLU1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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