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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd17284d198fd8a0efccdd737b267c27df0fd82a6ea9bd4cef4053657af017d9' 
  AND token = '4GYtSO7xeXyvXvi2rD22hEH72E1ZvHH/kM7xRN8SkWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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