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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91b93fe2ffe6d4b2989ed531744a9044e10f366bdbe0d8662bda17f337c3adfe' 
  AND token = '6gkvd2U/RmxgTz0er4fOOpfPAmGnTBMHb9743oYP17g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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