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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2f247813e087b4cd505fb3946262fd829e236bc5fdb94fc597ea8a36f698c1c' 
  AND token = 'H3N0sIZa+kVJobgoeR6hdM3Sa7jJwsu2MFHM2u1PmYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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