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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f54a3ca2470968ff761ce75c18c9f2e0959ef42b46fc868ac3abb63d0437f6f6' 
  AND token = '2gm/oEyJlSiTKv1f8YSLt7tW2/LmSiFCzr87NpTOTOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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