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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30d5dc37c9a94a2bd6a73d4c660b3470ae7d84371ff56cbc23101b7a9fc8ffe7' 
  AND token = 'CKAXk/H3xLNhcPmbQ+owP4hHJEBmtZKiS44VV2BA/eI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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