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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '269ede6c0b23b2fb217a0123c65e4412cc239cf810beb88636292106690527b6' 
  AND token = 'CQ5/35ZXbzu9lmetEems5sEptsRlhfbuzTNIaVtk/Oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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