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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bd6b1e36ccc7165ae78bfc5d15c11dd3cb9023d9dbbd2d154a97dda6d4af37d' 
  AND token = 'M5lHO/eE6clNWqg4geEfJFWFu/0c+61Sy893bFxS08o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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